CN108941861A - 27SiMn seamless steel pipe flat welding process - Google Patents
27SiMn seamless steel pipe flat welding process Download PDFInfo
- Publication number
- CN108941861A CN108941861A CN201810752472.0A CN201810752472A CN108941861A CN 108941861 A CN108941861 A CN 108941861A CN 201810752472 A CN201810752472 A CN 201810752472A CN 108941861 A CN108941861 A CN 108941861A
- Authority
- CN
- China
- Prior art keywords
- welding
- steel pipe
- seamless steel
- temperature
- 27simn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to seamless steel pipe welding technology fields, in particular it relates to a kind of 27SiMn seamless steel pipe flat welding process, comprising the following steps: (1) be evenly heated welding groove and its surrounding with welding torch before tack welding, Tp=230~250 DEG C, interlayer temperature are maintained at 250~300 DEG C；(2) postwelding is heat-treated after being carried out immediately with welding torch, 250~300 DEG C of postheat temperature, keeps the temperature 2 hours；After welding in 4 hours, progress stress relief annealing, 660~690 DEG C of temperature, heat preservation 2 hours, in this way, the martensitic structure content hardened in welding point is low, close to normalizing hardness, and 98% or more product qualification rate reaching, solve in the prior art 27SiMn seamless steel pipe to the crack problem of postwelding.
Description
Technical field:
The present invention relates to seamless steel pipe welding technology fields, and in particular, to a kind of 27SiMn seamless steel pipe flat welding process.
Background technique:
27SiMn seamless steel pipe is suitable for power plant, boiler factory, chemical industry, vehicle, accessory of steamer etc., is specifically broadly divided into following
Several classes: 1, fluid seamless steel pipe；2, boiler seamless steel pipe；3, boiler steel high pressure seamless pipe；4, fertilizer equipment high pressure
Seamless steel pipe；5, Seamless Steel Pipes For Geological Drilling；6, oil drilling seamless steel pipe；7, seamless steel tube for petroleum cracking；8, stone
The oily dedicated seamless steel pipe of drill collar；9, automobile axle shaft seamless steel pipe；10, Seamless Steel Tubes For Shipbuilding；11, the cold bundle of cold-drawn is accurate seamless
Steel pipe；12, hydraulic prop seamless steel pipe.27SiMn seamless steel pipe in above-mentioned application, the mostly executing agency in equipment,
It primarily serves carrying pressure or transmits the effect of torque, there are multiple structural forms, and be made of multiple components, these components are equal
It needs to become an entirety by welding assembly, wherein the girth joint between component is subject to the weld seam of pressure or torque most critical
One of, part as shown in Figure 1, weldment 1 imparts power to weldment 22 by girth joint 3, so girth joint 3 must be able to
Higher load is born, this requires weld metals and heat affected area must higher intensity, sufficiently high impact flexibility, and
And the defects of guaranteeing welding point flawless, slag inclusion.Therefore, welding process is the core that above-mentioned such part manufactures process
Content.In previous process of manufacture, the welding of 27SiMn seamless steel pipe lacks the process program of relatively optimization, and welding point is deposited
In more universal quality problems, especially weld crack, weld strength etc., rejection rate, repair rate is caused can not to have always been high any more.
Therefore, 27SiMn seamless steel pipe how is solved to the crack problem of postwelding, obtains the high-quality welding of intensity height, plasticity, good toughness
Connector is the key technical problem that must currently solve.
Summary of the invention:
The present invention overcomes the deficiencies of existing technologies, and provides a kind of 27SiMn seamless steel pipe flat welding process, solves the prior art
Crack problem of the middle 27SiMn seamless steel pipe to postwelding.
The technical problems to be solved by the invention are implemented with the following technical solutions: a kind of 27SiMn seamless steel pipe is to welder
Skill, comprising the following steps:
(1) welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C, interlayer temperature is protected
It holds at 250~300 DEG C；
(2) postwelding is heat-treated after being carried out immediately with welding torch, 250~300 DEG C of postheat temperature, keeps the temperature 2 hours；After welding
In 4 hours, stress relief annealing is carried out, 660~690 DEG C of temperature, keeps the temperature 2 hours.
Preferably, it is welded in the step (1) using carbon dioxide gas arc welding welding manner.
Preferably, Golden Bridge is used in the step (1)MG-50-Ti welding wire is welded.
Preferably, the welding groove in the step (1) is double V-groove.
Preferably, the V-butt is completed using machining, welds at preceding groove and its surrounding must clean out oil
The impurity such as dirt, iron rust, moisture, when welding, inside and outside each point three layers of welding are often soldered one layer, before welding next layer, will use sand
Turbine polishing welding bead, removes splashing and the slag of welding bead.
Preferably, the specification of 27SiMn seamless steel pipe isAnd welding machine parameter are as follows: electric current I=260~
290A, voltage U=29~33V.
Compared with prior art, the application has the beneficial effect that in the application, before tack welding by welding groove and its surrounding
It is evenly heated with welding torch, Tp=230~250 DEG C；Interlayer temperature is maintained at 250~300 DEG C；Heat after postwelding is carried out with welding torch immediately
Processing, keeps the temperature 2 hours by 250~300 DEG C of postheat temperature；After welding in 4 hours, progress stress relief annealing, temperature 660~
690 DEG C, 2 hours are kept the temperature, the martensitic structure content hardened in welding point is low, close to normalizing hardness, and product qualification rate reaching
98% or more, solve in the prior art 27SiMn seamless steel pipe to the crack problem of postwelding.
Detailed description of the invention:
Fig. 1 is 27SiMn weldment girth joint schematic diagram of the present invention；
In figure: 1~weldment one；2~welding two；3~girth joint；
Specific embodiment:
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is furture elucidated.
A kind of 27SiMn seamless steel pipe flat welding process,
(1) welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C, interlayer temperature is protected
It holds at 250~300 DEG C；
(2) postwelding is heat-treated after being carried out immediately with welding torch, 250~300 DEG C of postheat temperature, keeps the temperature 2 hours；After welding
In 4 hours, stress relief annealing is carried out, 660~690 DEG C of temperature, keeps the temperature 2 hours.
In the application, the welding base metal that 27SiMn seamless steel pipe is manufactured as product parts, since its welding performance is poor, institute
To always affect the welding quality of correlated parts.To obtain intensity height, the high-quality welded joint of plasticity, good toughness, using reason
By the method for combining test, the superiority and inferiority of the weldment as obtained by different process scheme is compared.It can be obtained by theory analysis, 27SiMn
Carbon equivalent value be greater than 0.4%, the cool attenuation of steel hardenability and welding point is strong, it is to be ensured that good welding matter
Amount, it is necessary to take the stringent welding technology measures such as weld preheating, control interlayer temperature, rear heat and postwelding stress relief annealing.And
Verifying through test result finally determines that optimised welding procedure, weld seam meet the key technology requirement of specific part welding.
Specifically:
1, welding base metal
27SiMn seamless steel pipe chemical component and mechanical property are as shown in table 1:
1 27SiMn seamless steel pipe chemical component of table and mechanical property
According to welding carbon equivalent calculation formula, the carbon equivalent of 27SiMn seamless steel pipe: Ceq=C+Mn/6+Si/ is calculated
24+Cr/5=0.51%, Ceq value are bigger (typically larger than 0.4%), and bigger by the hardenability of welding steel material, heat affected area is easier
It cracks.The carbon equivalent Ceq=0.51% of 27SiMn seamless steel pipe belongs to the poor steel grade of weldability, to guarantee to weld matter
Amount, it is necessary to increase the techniques such as weld preheating and post weld heat treatment.
2, welding method
(1) full-automatic carbon dioxide gas arc welding is able to achieve the welding sequence that the continuous wire feed of intelligence completes part, realizes
Mechanization and automation, improve welding efficiency, and it is a kind of welding method of low hydrogen, are suitable for as 27SiMn is this
The welding of the steel sensitive to cold crack.
(2) TIG (hand tungsten argon arc welding), resulting weldquality is optimal, but is generally only for welding Steel Thin-Wall
Pipe, since tungsten electrode is held, current-carrying ability is limited, and excessive welding current will lead to the scaling loss and evaporation of tungsten electrode, so unsuitable
In the welding of thick walled steel tube, and this method is manually non-automated, and production efficiency is low.
(3) manual electric arc welding, equipment is simple, technique is flexible, is widely used, but the deposition rate of its welding rod is low, welding rod
Length is fixed, and needs constantly to replace welding rod in the welding process, increases the non-cutting time of welding, and cleaning welding slag splashes time-consuming take
Power, production efficiency are low.
Selection first method, i.e. dioxy are had only for the welding of 27SiMn seamless steel pipe according to the comparison of the above method
Change carbon gas shielded arc welding, could effectively meet the needs of production technology.
3, welding wire
It, must in welding wire because welding surroundings have very strong oxidisability when being welded with carbon dioxide gas arc welding
A certain amount of deoxidant element must be added.In addition, should also select low hydrogen type welding wire as far as possible, they not only have certain desulfurization energy
Power, and deposited metal plasticity and toughness are good, spread hydrogen amount in addition less, no matter come to fire check or hydrogen cooling crack
It says, crack resistance is all higher.Golden Bridge welding wire MG-50-Ti also added in addition to it is with the appropriate deoxygenated alloy element such as Si, Mn
Ti.Since the addition of Ti can be such that the spherical molten drop of welding wire refines, stable electric arc can be played the role of, the corresponding production splashed with smog
Raw amount can also be greatly lowered, and there are also the effects that can make welding bead crystal grain refinement by Ti, can enhance the intensity and impact value of weld seam.
Welding wire selects Golden BridgeMG-50-Ti welding wire, chemical component are as shown in table 2.
2 diameter of table isThe chemical analysis of MG-50-Ti welding wire
4, groove type
From convenient for machining, from the point of view of guaranteeing groove size precision, double V-groove is preferentially selected, and using two-sided
The method of welding, in elder generation after it is outer, welded using this groove, main there are three advantages: 1. compared with other groove types,
Reduce welding metal volume, reduce the accumulation of welding seam heat, controls the deflection of weldment to a certain extent；2. due to
It is boxing crack structure, so the welding condition of its downhand position is good, and welding current can increase in right amount, then speed of welding can obtain
Raising to a certain extent；3. the electric arc residence time can suitably lengthen in the two sides of groove, to prevent undercut, and it is easy to grasp
Make, promotes the raising of weldquality.Bevel shape is completed using machining.It must be cleared up at groove and its around before welding dry
The impurity such as absolute oil dirt, iron rust, moisture.Inside and outside each point three layers of welding, are often soldered one layer, before welding next layer, will use grinding wheel
Machine polishing welding bead, removes splashing and the slag of welding bead.
5, welding parameter is tested
Heat input is controlled when welding, prevents it from excessively high, otherwise the heat affected area of welding point will be kept wide, coarse grain zone
Expand, welding point toughness is caused to decline.In order to which short form test gives top priority to what is the most important, the welding of this step be all made of weldering before do not preheat,
Interlayer temperature do not control, welding method of the postwelding without stress relief annealing, we are carried out with different electric currents with voltage respectively
Sample welding, then carries out sample Mechanics Performance Testing, and ultimate analysis obtains best welding machine parameter.
(1) weldment selects
Select specification for27SiMn seamless steel pipe.Welding groove is obtained by machining, guarantees processing
Surface is smooth, smooth, foreign.For the comparativity for guaranteeing each group test result, welding material, welding position, equipment should ensure that
And electric power polarity, welding temperature etc. are all the same.
(2) experimental design
We carry out the welding of weldment with different electric current and voltage respectively, and concrete scheme is as shown in the table:
Table 3
(3) sample Mechanics Performance Testing
In order to which the result to above-mentioned three kinds of welding parameter schemes is evaluated, the sample that three kinds of welding parameter schemes are obtained
Stretched according to the mechanical property test standard (JB4708-2000) in " pressure vessel welding procedure qualification test method ",
The tests such as bending, impact.20 samples are respectively welded in our every kind of scheme herein, and test result is as shown in table 4 below:
Table 4
It is calculated through part strength, weld(ing) deposit tensile strength must be greater than 550MPa or more, three kinds of parametric schemes
Tensile strength values can meet the requirements；The criterion of acceptability of bend test is that sample is pressed onto always and connects with curved mould bottom by elbow
When touching, the i.e. bending angle of sample are 180 °, any direction does not allow length occur greater than 2mm in Seam and heat effected zone
Crackle, as a result 2 test specimen qualification rate highest of scheme；The impact toughness value of the weld dimensions of three kinds of parametric schemes, scheme 1,2
Meet the specified value (>=39) of welding base metal standard.
Be comprehensively compared parametric scheme 2 is optimal, therefore best welding machine parameter are as follows: electric current I=260~290A, voltage U=
29~33V.
6, preheating temperature
Since the welding performance of 27SiMn steel is poor, need weld preheating that can just prevent crackle.
Tp=1400Pc-392
Pc=Pcm+ [H]/6+h/600
Pcm=C+Mn/20+Si/30+Ni/60+Cr/20+Mo/15+V/10
Tp-preheating temperature (DEG C)；Pc-weld crack Sensitivity Index；Pcm-welding cold cracking Sensitivity Index；H-plate
Thick (mm)；[H]-applies molten metal diffusible hydrogen content.
It can be obtained by above-mentioned formula, the preheating temperature of material and its chemical component apply molten metal diffusible hydrogen content and plate thickness
It is related.
[H]=0.04ml/g of MG-50-Ti welding wire, then can obtain Pcm=0.398, Pc=0.43, then obtain Tp=
210℃.Since weld preheating temperature is often by environment temperature, cooling condition, the planform of weldment, execution conditions, welder
The influence of the factors such as operating technology can properly increase on the basis of same execution conditions for the reliability for ensuring pre- heat effect
20~40 DEG C of preheating temperature, i.e., desirable Tp=230~250 DEG C.
7, post weld heat treatment
In weld seam diffusible hydrogen content it is excessively high be generate cold crack the main reason for one of.Contain to reduce diffusible hydrogen in weld seam
Amount, this test use post weld heat treatment, make hydrogen adequately from diffusion evolution in molten metal is applied, heating and temperature control is 250~300
DEG C, soaking time is determined by groove thickness, generally 2h hours.
8, the testing inspection of welding procedure
8.1 experimental design
To obtain a not only reasonable but also applicable welding procedure, we have drafted following four welding procedure design:
Technique a: it is not preheated before weldering；Interlayer temperature does not control；Postwelding with welding torch flash back to 270 DEG C or so it is air-cooled；Postwelding is not
Carry out stress relief annealing.
Technique b: welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C；Interlayer temperature
Degree does not control；Postwelding with welding torch flash back to 270 DEG C or so it is air-cooled；Postwelding is without stress relief annealing.
Technique c: welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C；Interlayer temperature
Degree does not control；Postwelding with welding torch flash back to 270 DEG C or so it is air-cooled；After welding in 4 hours, stress relief annealing, temperature are carried out
660~690 DEG C, keep the temperature 2 hours.
Technique d: welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C；Interlayer temperature
Degree is maintained at 250~300 DEG C；Postwelding is heat-treated after being carried out immediately with welding torch, 250~300 DEG C of postheat temperature, keeps the temperature 2 hours；
After welding in 4 hours, stress relief annealing is carried out, 660~690 DEG C of temperature, keeps the temperature 2 hours.
8.2 sample Mechanics Performance Testings
In order to which the result to above-mentioned four kinds of welding procedure designs is evaluated, the test specimen that four kinds of welding procedures are obtained according to
Mechanical property test standard (JB4708-2000) in " pressure vessel welding procedure qualification test method " is stretched, is curved
The tests such as bent, impact.
8.3 test result analysis and welding procedure determine
(1) test result analysis
Every kind of process program welds 10 samples in above-mentioned four kinds of process programs, and test result is as shown in table 5:
The test result of 5 four kinds of processes of table
It is calculated through part strength, weld(ing) deposit tensile strength must be greater than 550MPa or more, four kinds of process programs
Tensile strength values can meet the requirements；The criterion of acceptability of bend test is that sample is pressed onto always and connects with curved mould bottom by elbow
When touching, the i.e. bending angle of sample are 180 °, any direction does not allow length occur greater than 2mm in Seam and heat effected zone
Crackle, as a result only technique d test specimen is all qualified；The impact toughness value of the weld dimensions of four kinds of process programs removes technique
Outside a, though remaining is not less than the specified value (>=39) of welded base material standard, the impact toughness value of technique d is compared to maximum；From base material,
The hardness number analysis of weld dimensions can obtain, and the martensitic structure hardened in the welding point of technique d is minimum, close to normalizing
The hardness of hardness, excess-three kind scheme is higher, and hardened structure content is higher, is easy to produce cold crack.
(2) determination of welding procedure
Can be obtained according to the analysis of above-mentioned test result, technique d meet part welding two aspect key request: 1.
There are some strength, rigidity and sufficiently high impact flexibility in weld metal and heat affected area；2. the defects of welding point flawless.Institute
With our final choice technique d are as optimised welding procedure.According to the content of technique d, we have formulated 27SiMn seamless steel
The welding procedure specification (WPS) of pipe, as shown in table 6, post weld heat treatment temperature are all 660~690 DEG C, and soaking time is 2 hours.
The welding procedure specification (WPS) of 6 27SiMn seamless steel pipe of table
Butt welding is carried out to 27SiMn seamless steel pipe using the above-mentioned welding procedure finally determined, then presses JB 1152-81 couple
Weld seam carries out ultrasound examination, product qualification rate reaching 98% or more, it was demonstrated that the welding procedure is practicable.
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (6)
1. a kind of 27SiMn seamless steel pipe flat welding process, it is characterised in that: include the following steps,
(1) welding groove and its surrounding are evenly heated with welding torch before tack welding, Tp=230~250 DEG C, interlayer temperature is maintained at
250~300 DEG C；
(2) postwelding is heat-treated after being carried out immediately with welding torch, 250~300 DEG C of postheat temperature, keeps the temperature 2 hours；4 is small after welding
When it is interior, carry out stress relief annealing, 660~690 DEG C of temperature, keep the temperature 2 hours.
2. 27SiMn seamless steel pipe flat welding process according to claim 1, it is characterised in that:
It is welded in the step (1) using carbon dioxide gas arc welding welding manner.
3. 27SiMn seamless steel pipe flat welding process according to claim 1, it is characterised in that:
Golden Bridge is used in the step (1)MG-50-Ti welding wire is welded.
4. 27SiMn seamless steel pipe flat welding process according to claim 1, it is characterised in that:
Welding groove in the step (1) is double V-groove.
5. 27SiMn seamless steel pipe flat welding process according to claim 4, it is characterised in that:
The V-butt is completed using machining, welds at preceding groove and its surrounding must clean out greasy dirt, iron rust, moisture
Equal impurity, when welding, inside and outside each point three layers of welding are often soldered one layer, before welding next layer, will use abrasive machine polishing weldering
Splashing and the slag of welding bead are removed in road.
6. 27SiMn seamless steel pipe flat welding process according to claim 1, it is characterised in that: the rule of 27SiMn seamless steel pipe
Lattice areAnd welding machine parameter are as follows: electric current I=260~290A, voltage U=29~33V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752472.0A CN108941861A (en) | 2018-07-10 | 2018-07-10 | 27SiMn seamless steel pipe flat welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752472.0A CN108941861A (en) | 2018-07-10 | 2018-07-10 | 27SiMn seamless steel pipe flat welding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108941861A true CN108941861A (en) | 2018-12-07 |
Family
ID=64482846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810752472.0A Pending CN108941861A (en) | 2018-07-10 | 2018-07-10 | 27SiMn seamless steel pipe flat welding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108941861A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369734A (en) * | 2021-06-03 | 2021-09-10 | 中煤北京煤矿机械有限责任公司 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1188032A (en) * | 1997-01-15 | 1998-07-22 | 珠海市万达焊条有限公司 | Square groove welding technology for welding pipeline by using continuous welding rod |
| JP2010029941A (en) * | 2009-08-24 | 2010-02-12 | Jfe Steel Corp | Method for manufacturing circumferential weld joint of martensitic stainless steel tube |
| CN103990895A (en) * | 2014-05-14 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding method for high-strength seamless steel tube |
| CN105983754A (en) * | 2015-01-31 | 2016-10-05 | 重庆麦卡瑞机械制造有限公司 | Pipeline welding process |
| CN106238868A (en) * | 2016-07-29 | 2016-12-21 | 天津市世纪道康建筑科技有限公司 | A kind of welding procedure of seamless steel pipe |
-
2018
- 2018-07-10 CN CN201810752472.0A patent/CN108941861A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1188032A (en) * | 1997-01-15 | 1998-07-22 | 珠海市万达焊条有限公司 | Square groove welding technology for welding pipeline by using continuous welding rod |
| JP2010029941A (en) * | 2009-08-24 | 2010-02-12 | Jfe Steel Corp | Method for manufacturing circumferential weld joint of martensitic stainless steel tube |
| CN103990895A (en) * | 2014-05-14 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding method for high-strength seamless steel tube |
| CN105983754A (en) * | 2015-01-31 | 2016-10-05 | 重庆麦卡瑞机械制造有限公司 | Pipeline welding process |
| CN106238868A (en) * | 2016-07-29 | 2016-12-21 | 天津市世纪道康建筑科技有限公司 | A kind of welding procedure of seamless steel pipe |
Non-Patent Citations (1)
| Title |
|---|
| 印波等: "27SiMn焊接工艺的研究", 《机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369734A (en) * | 2021-06-03 | 2021-09-10 | 中煤北京煤矿机械有限责任公司 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102753300B (en) | Ultra high-strength welded joint and method for producing same | |
| CN104858555A (en) | Pressure pipeline welding process | |
| CN102886593B (en) | A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe | |
| CN104508165A (en) | High strength steel weld metal for demanding structural applications | |
| CN103769728B (en) | With flux-cored wire CO2The technique of gas shield welding soldering cast steel part defect | |
| CN102500892B (en) | Micro-alloying TMCP (Thermal Mechanical Control Processing) Q460 steel FCAW (Flux Cored Arc Welding) welding method | |
| CN101337298A (en) | Low-alloy high-strength steel welding process | |
| CN103433603A (en) | Equal-strength matching submerged arc welding method for strong-strength P690QL1 steel | |
| CN112792479B (en) | High-strength high-toughness gas shielded welding solid welding wire for X90 pipeline steel and preparation method thereof | |
| CN105665898A (en) | Automatic submerged arc welding method for pearlitic heat-resistant steel composite board | |
| CN101722383A (en) | Flux-cored wire and method for welding cold-rolled work roll by same | |
| JP6201803B2 (en) | Submerged arc welds with excellent low temperature toughness | |
| CN106903405A (en) | A kind of low thermal weld stress method of improvement P92 pipeline welding performances | |
| CN101722385A (en) | Flux-cored wire and method for welding hot-rolled back-up roll by same | |
| CN110640349A (en) | Welding process of Mn13 high-manganese steel | |
| CN108637525A (en) | A kind of Hi-Stren steel welding wire for submerged-arc welding for exempting from postwelding destressing processing | |
| CN110480208A (en) | Nickel-base alloy bare welding filler metal and preparation method and welding procedure for LNG storage tank welding | |
| CN104511700A (en) | Nickel base alloy welding wire and preparation method thereof | |
| Lu et al. | Mechanical properties and microstructure of flash-butt CT-90 steel weldet joint | |
| CN108941861A (en) | 27SiMn seamless steel pipe flat welding process | |
| CN109530883A (en) | A kind of stainless steel 310S welding procedure | |
| JP4593399B2 (en) | Manufacturing method of UO steel pipe excellent in low temperature crack resistance and UO steel pipe | |
| CN107999937A (en) | A kind of long distance pipeline full-automatic welding process | |
| Ling et al. | Effect of welding sequence of a multi-pass temper bead in gas-shielded flux-cored arc welding process: hardness, microstructure, and impact toughness analysis | |
| CN109530849B (en) | Welding construction method for carbon steel pipeline in acidic environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
|
| RJ01 | Rejection of invention patent application after publication |